So we don't read out stale CRCs from a previous run left in the buffer.
Signed-off-by: Damien Lespiau <[email protected]>
---
drivers/gpu/drm/i915/i915_debugfs.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
b/drivers/gpu/drm/i915/i915_debugfs.c
index 787c50d..ec9151a 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1820,6 +1820,12 @@ static int pipe_crc_set_source(struct drm_device *dev,
enum pipe pipe,
if (pipe_crc->source && source)
return -EINVAL;
+ /* none -> real source transition */
+ if (source) {
+ atomic_set(&pipe_crc->head, 0);
+ atomic_set(&pipe_crc->tail, 0);
+ }
+
pipe_crc->source = source;
switch (source) {
--
1.8.3.1
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